We divide 54037691 by 666
The aim is to understand the frequency of 666 in 54037691.

Moving on to step 1:
The number 666 fits into 5 0 times, leaving a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 666

Moving on to step 2:
666 can be fit into 54 0 times, resulting in a remainder of 54.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 54 and we're left with 54.
Bring next digit (0) of the dividend behind the 54 and repeat the process: 540 / 666

On to step 3:
The number 666 fits into 540 0 times, leaving a remainder of 540.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 540 to get 540.
Fetch the next digit (3) from the dividend, attach it to 540 and continue: 5403 / 666

Moving on to step 4:
666 goes into 5403 8 times with a remainder of 75.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we subtract 5328 from 5403, we get 75.
Append the next digit (7) from the dividend to 75 and continue with: 757 / 666

Step 5:
757 divided by 666 is 1 with a remainder of 91.
Record the quotient 1 as the next digit in the result. 
Result so far: 81.0
If we take 666 away from 757, we end up with 91.
Take the next digit (6) from the dividend and append it to 91, then repeat: 916 / 666

Moving on to step 6:
When dividing 916 by 666, we get 1 with a remainder of 250.
The next digit of our result is 1. 
Result so far: 811.0
Subtract 666 from 916 to get 250.
Include the next digit (9) from the dividend after 250, then repeat: 2509 / 666

Let's proceed to step 7:
The number 666 fits into 2509 3 times, leaving a remainder of 511.
Write down 3 as next digit of the result. 
Result so far: 8113.0
If we subtract 1998 from 2509, we get 511.
Include the next digit (1) from the dividend after 511, then repeat: 5111 / 666

Going ahead to step 8:
When dividing 5111 by 666, we get 7 with a remainder of 449.
Use 7 as the next digit of our solution. 
Result so far: 81137.0
Subtracting 4662 from 5111 leaves us with 449.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4490, and continue the process.

Moving on to step 9:
The number 666 fits into 4490 6 times, leaving a remainder of 494.
Record the quotient 6 as the next digit in the result. 
Result so far: 81137.6
Subtracting 3996 from 4490 leaves us with 494.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4940, and continue the process.

On to step 10:
When dividing 4940 by 666, we get 7 with a remainder of 278.
Use 7 as the next digit of our solution. 
Result so far: 81137.67
If we take 4662 away from 4940, we end up with 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

Let's proceed to step 11:
666 can be fit into 2780 4 times, resulting in a remainder of 116.
Record the quotient 4 as the next digit in the result. 
Result so far: 81137.674
Subtracting 2664 from 2780 leaves us with 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Step 12:
1160 divided by 666 is 1 with a remainder of 494.
The next digit of our result is 1. 
Result so far: 81137.6741
The remainder is 494 after subtracting 666 from 1160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4940, and continue the process.

Advancing to step 13:
If we divide 4940 by 666, we get 7 and a remainder of 278.
Record the quotient 7 as the next digit in the result. 
Result so far: 81137.67417
If we subtract 4662 from 4940, we get 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

Going ahead to step 14:
If we divide 2780 by 666, we get 4 and a remainder of 116.
The number 4 becomes the next digit in our result. 
Result so far: 81137.674174
If we subtract 2664 from 2780, we get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

On to step 15:
When dividing 1160 by 666, we get 1 with a remainder of 494.
Record the quotient 1 as the next digit in the result. 
Result so far: 81137.6741741
If we subtract 666 from 1160, we get 494.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4940, and continue the process.

On to step 16:
If we divide 4940 by 666, we get 7 and a remainder of 278.
Write down 7 as next digit of the result. 
Result so far: 81137.67417417
Deduct 4662 from 4940 and we're left with 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

In conclusion, the division gives 81137.67417417 with a balance of 2.78e-07.